Unknown alloy formed in Hiroshima nuclear explosion, scientists find
The atomic bomb dropped on Hiroshima created a previously unknown material, scientists have discovered.
Researchers found the metal alloy hidden inside tiny grains of fallout left behind by the 1945 blast.
They believe it formed in the nuclear fireball itself, where temperatures of more than 7,000°C instantly vaporized buildings, steel, glass, and soil before everything cooled again in a matter of moments.
Such extreme conditions produced an unusual substance unlike anything scientists have ever recorded.
The microscopic fragment was discovered inside a glassy particle known as a ‘hiroshimaite’, recovered from beach sands in Hiroshima Bay almost 80 years after the attack.
Scientists say the alloy is made from a mixture of iron, chromium, nickel, manganese, molybdenum, silicon, and aluminum – ingredients commonly found in stainless steel.
But instead of forming the way those metals normally would, the atoms became locked into a completely new arrangement as the fireball cooled at incredible speed.
Researchers say the discovery shows that nuclear explosions can create entirely new materials that simply cannot form under normal conditions on Earth.
For the study, scientists from the University of Florence analyzed 34 tiny glassy particles collected from Hiroshima Bay.
Using powerful microscopes and X-ray analysis, they searched the debris for unusual materials created during the explosion.
One metallic grain, measuring just a few thousandths of a millimeter across, immediately caught their attention.
Although its chemical ingredients looked familiar, its internal structure matched nothing previously known.
After comparing it with thousands of existing materials, the team concluded that it was a new alloy.
Writing in the journal Science Advances, they said: ‘We report the discovery of a previously unknown multicomponent alloy recovered from beach sands of Hiroshima Bay, formed during the August 6 1945 atomic airburst.’
The team says the findings raise the possibility that other undiscovered materials are still hidden among microscopic debris left behind by the bombing.
Studying how these materials formed could also help scientists better understand how matter behaves under the most extreme temperatures and pressures.
The atomic bomb dropped on Hiroshima, codenamed “Little Boy”, was the first nuclear weapon ever used in war.
It was released at 8:15 am on August 6, 1945, and detonated around 1,900 ft above the city to maximize the destruction below.
The blast unleashed the equivalent of around 15,000 tons of TNT.
An estimated 60,000 to 80,000 people died instantly.
By the end of 1945, the death toll had risen to around 140,000 as thousands more succumbed to burns, injuries, and radiation sickness.
Deputy Editor
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